PROBLEM 3. Living Things Are Named and Classified 103 



Further Activities in Biology 



1. With some help in the beginning you can learn how to construct a 

 key for some group of plants or animals. You might first make a key to 

 "key down" one of twenty or thirty assorted books on your bookshelves. 

 (Hint: The library uses a key.) Then collect leaves, shells, seeds, etc., 

 and construct a key for each. Have some classmate try it in order to test 

 your skill. 



2. Could you prepare a key for keying down each member of your 

 class? {Hint: How does the school classify pupils?) 



In UNIT II you "will consider these problems: 



Problem i . Of What Are All Living Things Composed? 

 Problem 2. How Do Their Activities Keep Cells Alive? 

 Problem 3. How Are the Cells Arranged in Animals and Plants? 



